Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..551c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 15, 1988, p. 551-563.
Astronomy and Astrophysics
Astrophysics
46
Cosmic Gases, Disk Galaxies, Ejecta, H I Regions, Spiral Galaxies, Absorption Spectra, Astronomical Models, Conductive Heat Transfer, High Temperature Gases, Quasars, Steady Flow, Thermal Stability
Scientific paper
Some of the properties of 'outer galactic fountains', hot dynamic flows which reach the outer disks of spiral galaxies after some supernova blast waves break through the inner stellar disk with more than average specific angular momentum, are outlined. Numerical simulations of steady downward flows onto the galactic plane are performed for a wide range of mass flow rates and injection temperatures. Three different values for the extragalactic flux of soft X-rays are considered. The buildup of an H I disk is discussed, showing that irregularities in the flow are oscillatory rather than secularly unstable. Conjectures on future models with heat conduction and cases without a steady cooling flow are considered. The strong effect which even a weak galactic fountain can have on the shape of the outer edge of an H I disk is examined. Evaporative flows in young galaxies, which shrink the overall H I disk and may be relevant for some quasar absorption lines, are addressed.
Corbelli Edvige
Salpeter Edwin E.
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